Windmill motor noise

I just changed the belt of my windmill to lower the noise level as the old one is too thick and has an opening which keeps making a tatatata sound. Yet after running for a week in peaceful silence, the motor starts rattling, I can see the belt is a bit slacking. Moving the cove shell does not help. Any thoughts?

Thompson

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Can you post a link of the motor sound. Could be bad brushes or bearings
Jeff

Take the belt off and see if you still have the sounds

Very familiar with the tata sound. On mine it’s the belt touching the guard.